Friend recommendations plus online searches equal a $500 billion opportunity for local businesses to market themselves on Facebook, say the makers of Stik, an online review website. Trust is important when selecting the person who will dive inside your mouth with a sharp object (your dentist) or the person who will help you save for the home you want now as well as the one you’ll retire in (your financial planner). In this infographic, Stik shows exactly which service providers people might be able to find using Facebook’s search bar, Graph Search.